Cementitious flooring



Sept 29, 1931 P. sYLvEsTER CEMENTITIOUS FLOORING Q l5, g.

W' gx i I@ NIW' Y l) l* .3 Q Q* Patented Sept. 29, 19,31

UNITED STATES PAscALsYLvEs'rER, or corriendo, ILLiNoIs cEMEN'rr'rroUs rLooRINe l Application led February 23, 1928,` Serial No.25673.

. The object of the invention is to provide an improved form of partition strip which, while susceptible of use in cementitious flooring of various kinds, is particularly well adapted in the laying of what is known as terrazzo flooring. The invention consists in the features of novelty hereinafter described, illustrated in the accompanying drawings and particularly pointed out in the claims at the end of this specification.

In the drawings:

Fig. l is a view of a blank showing the manner in which my improved partition strip will be formed. e

Fig. 2 is a view in vertical section through part of a flooring having my invention applied thereto.

Fig. 3 is a view in vertical section on the line 3 3 of Fig. 2.

In laying terrazzo iooring it is customary to spread upon a suitable 'foundation an under-bed of concrete on which will be laid a Wearing surface that is divided by partigtion strips into patternsrof desired designs. In the drawings, the reference numeral 1 designates the underbed of concrete and 2 denotes the upper wearing surface of the flooring. My improved partition strip 3, by which the upper surface of the flooring is divided into designs or patterns, is formed of sheet metal having an imperforate upper `portion from which project downwardly prongs adapted to be embedded in and interlocked with the under-bed 1 of the flooring. In the preferred form of the invention, the downwardly projecting prongs of the partition strip 3 are formed with narrow portions 4, their lower ends being expanded or provided with extensions 5. The spaces between the depending prongs of the strip 3 are adapted to admit the concrete of, the under-bed l, so that when the strips have been positioned to form the desired designs or patterns, the strips will be securely interlocked with the under-bed l against danger of displacement. It will also be noted that the shape of the prongs and the spaces between the prongs, is substantially thesame and of the same area. Also that the shape of the prongs and spaces shown in the present instance is such that .a comparatively large bottom edge area is provided on 'both the bottom kofthe upper, imperforatef part of the. strip. and on the .bottom edges of the prongs. Such large bottom areas facilitate positioning of the prongs in the cementitious flooring -by tending to prevent sinking of the strips in the underbed while the latter remains in a more or less plastic condition and before the wearing surface is applied. f .L60

After the strips 3 have been suitably set` in the under-bed l, the terrazzo wearing surface will be laid on each side of the strip 3 in the usual manner, theupper face of the wearing surface 2 coming Hush with the 55 smooth upper edge of the strip 3, as indicated in Fig; 3 of the'drawings.

In order to enable the partition strips embodying my invention to be readily and economically manufactured without loss of material, I have provided a novel method of making these strips. To this end, the strips are made from a narrow metal plate or sheet having' parallel outer edges as will be seen by reference to the blank shown in Fig. 1 175 of the drawings. This Ymetal plate or sheet will then be divided .longitudinally upon a parting line 6 that will sever the sheet into two sections, each of which sections will thus be formed with depending prongs, prefer80 ably of the construction hereinbefore described. By'this method my improved partition strip may be formed without any waste of material. H

It may be understood that the precise de- "'80 tails above set forth may be varied without departing from the scope of the invention, and that features of the invention may be employed without its adoption as an T entirety.

I claim:

1. A sheet metal partition strip for cementitious flooring, said strip comprising an upper imperforate part and a lower part in-`V cluding a plurality of spaced downwardly projecting prongs, integral with said upper part, said prongs being provided with widened portions spaced from said upper part, the area of said prongs bein-g substantially?.` m0

equal to the area of the spaces between them and said prongs and spaces being of substantially like shapes. c

2. AV sheet material partition strip for cementitious liooring, said stripcomprising an upper part and a lower part, said lower part including a plurality of spaced, down- Wardly projecting prongs, formed integral with said upper part, said prongs having widened lower portions and comparatively u narrow neck portions intermediate said widened portions and upper part whereby the combined area of the bottom edges of said widened lower prong portions and the bot tom edges of said upper part. intermediate.. ,5 said neck portions, 1s materially increased over the area of a normal straight bottom edge, thereby to facilitate Vertieal positioning of the strips in the cementitious flooring.

PASCAL SYLVESTER. 

